Answer this question truthfully
### Question: What causes Interstitial keratitis?
### Response: Interstitial keratitis is a serious condition in which blood vessels grow into the cornea. Such growth can cause loss of the normal clearness of the cornea. This condition is often caused by infections.
Syphilis is the most common cause of interstitial keratitis, but rare causes include:
Autoimmune diseases, like rheumatoid arthritis and sarcoidosis Leprosy Lyme disease Tuberculosis